<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>

<script language="JavaScript">
//	
//	alert("8"+1==9); //false
//	alert(2+3==="5");//false
//	alert("3"+"3"===33);//false
//	alert(2+6=="8");//true
	
	
	
	
	
	
	
	
	
</script>

<script>
	
	var a=new Array(2,3,4,5,6);
	var sum=0;
	for(i=1;i<a.length;i++)
	sum+=a[i];
	document.write(sum);
	
	
	
	
	
	
	
	
	
	
</script>


	</body>
</html>
